A company car, often referred to as a service vehicle, is provided by the employer and may only be used for business purposes. It must not be used privately, except to a very limited extent. This is an important distinction compared to a benefit-in-kind company car and places specific requirements on how the vehicle is managed, documented and monitored.
According to HMRC, there is no taxable benefit if the vehicle:
Is used exclusively for business purposes, and
Is not used for private journeys, except in exceptional cases (maximum 10 occasions and up to 1,000 miles per tax year).
If these limits are exceeded, the vehicle is considered to have been used privately, and a taxable benefit-in-kind arises.
Tradespeople, installers, field technicians and field sales staff
Vehicles fitted with fixed equipment or tools
Vehicles parked at the workplace or secured overnight
Clear documentation (for example, a digital driving log) is essential to demonstrate that the vehicle is not used privately and to avoid unintended tax liabilities.
HMRC requires that the employer has effective control over how the vehicle is used. It must be possible to demonstrate that the vehicle is not used for private purposes.
In practice, this is ensured through:
A mileage log – showing that all journeys are business-related
Internal company policies and procedures – for example, requiring the vehicle to be left at the workplace after working hours
Vehicle specification and equipment – such as fixed racking, specialist fittings or clear company branding indicating that the vehicle is not intended for private use
Clear documentation is essential in the event of an HMRC review.
If an employee uses the vehicle for private purposes (for example, weekend trips or commuting home without qualifying business-only status), this is treated as a Benefit-in-Kind (BIK) – even if the private use is only occasional.
In such cases, the benefit value must be calculated and taxed according to HMRC’s rules.
Important: Even minor private deviations can be regarded as private use and may trigger a taxable benefit.
To demonstrate that a company vehicle is not used privately — or to correctly account for private use — HMRC requires accurate and up-to-date mileage records. These records are essential for tax compliance, especially when claiming business mileage or reporting company car benefits.
A compliant mileage log should include:
Date of each journey
Start and end location
Purpose of the trip (business or private)
Odometer reading at the start and end of the journey
Total miles driven
Driver’s name (if multiple drivers use the vehicle)
Maintaining clear separation between business and private mileage is crucial.
Without proper records, HMRC may treat the vehicle as a taxable company car benefit, which can result in additional Income Tax and National Insurance liabilities for both the employee and employer.
For businesses that use vehicles for work purposes, a digital mileage log is a simple solution that meets HMRC requirements — while making day-to-day administration easier.
Automatic trip recording via GPS or vehicle sensors.
Clear documentation proving the vehicle is used solely for business (where applicable).
Helps prevent unauthorised private use – user permissions and alerts can be configured.
Easy report generation for audits, internal reviews, or HMRC enquiries.
Secure cloud storage, with records retained for up to 7 years in line with UK record-keeping requirements.
Reduces administrative workload – no manual mileage tracking required.
Provides fleet visibility and control for employers.
Protects against incorrect tax assessments during compliance checks.
A company vehicle used strictly for business purposes should not create a taxable Benefit-in-Kind — but this requires clear and accurate documentation.
A digital mileage log provides businesses and drivers with a secure and efficient way to meet HMRC requirements, while minimising administrative effort.
Want to reduce compliance risk and administrative burden?
Use a digital mileage solution to document every journey accurately — automatically, securely and audit-ready.
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